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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-03-19 14:07:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-19 16:31:39 +0100 |
| commit | 4c41aa24baa4ed338241d05494f2c595c885af8f (patch) | |
| tree | 66e40138eae73dd94f4da1d9c2081992599c132e /drivers/staging/ncpfs | |
| parent | b769949981fb2f3201d42ecf66b4116861a8e998 (diff) | |
| download | linux-4c41aa24baa4ed338241d05494f2c595c885af8f.tar.bz2 | |
staging: ncpfs: memory corruption in ncp_read_kernel()
If the server is malicious then *bytes_read could be larger than the
size of the "target" buffer. It would lead to memory corruption when we
do the memcpy().
Reported-by: Dr Silvio Cesare of InfoSect <Silvio Cesare <silvio.cesare@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/ncpfs')
| -rw-r--r-- | drivers/staging/ncpfs/ncplib_kernel.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/staging/ncpfs/ncplib_kernel.c b/drivers/staging/ncpfs/ncplib_kernel.c index 804adfebba2f..3e047eb4cc7c 100644 --- a/drivers/staging/ncpfs/ncplib_kernel.c +++ b/drivers/staging/ncpfs/ncplib_kernel.c @@ -981,6 +981,10 @@ ncp_read_kernel(struct ncp_server *server, const char *file_id, goto out; } *bytes_read = ncp_reply_be16(server, 0); + if (*bytes_read > to_read) { + result = -EINVAL; + goto out; + } source = ncp_reply_data(server, 2 + (offset & 1)); memcpy(target, source, *bytes_read); |